施工阶段箱形桥混凝土温度梯度研究  

Study on concrete temperature gradient of box bridge during construction

作　　者：胡同旭 张拥军[1] 赵敏[1] 杨登峰[1] 赵建锋[1] HU Tong-xu;ZHANG Yong-jun;ZHAO Min;YANG Deng-feng;ZHAO Jian-feng(School of Civil Engineering,Qingdao University of Technology,Qingdao 266033,China)

机构地区：[1]青岛理工大学土木工程学院,青岛266033

出　　处：《青岛理工大学学报》2020年第5期117-125,共9页Journal of Qingdao University of Technology

基　　金：国家自然科学基金资助项目(51778314)。

摘　　要：为了研究施工过程中箱形桥混凝土截面温度变化及温度梯度,利用ABAQUS软件建立箱梁段(A1,A4,A6)模型.利用现场采集的桥梁洞室内外环境温度作为温度场边界条件,对施工期间箱梁桥的不同截面混凝土温度进行模拟.选定2 d进行全天桥梁温度监测,并对比模拟与实测数据.结果表明:当外部温度越高,内外温差越小时,混凝土内部梯度的差异越小,与中国、美国、新西兰相关规范拟合线越偏离,反之接近.研究施工中箱梁桥面板(暂未铺道砟)发现,现有中国规范(TB 10002.3—2005)中有砟混凝土梁桥温度幂指函数指数a上浮20%~40%后更接近施工中的温度梯度变化.In order to study the temperature change and temperature gradient of the concrete cross section of the box girder bridge during construction,the model of the box girder section(A1,A4,A6)was established by using ABAQUS software.Using the indoor and outdoor ambient temperatures collected on site as the boundary conditions of the temperature field,the concrete temperatures of different sections of the box girder bridge during the construction were simulated.Two days were selected for bridge temperature monitoring throughout the day,and the simulated and measured data were compared.The results show that when the external temperature is higher,and the internal and external temperature difference is smaller,the internal gradient difference of the concrete is smaller,and the deviations of the fitting line among the specifications of Chinese norm,American norm,New Zealand norm are greater.It is found from the study on the construction of box girder bridge slab(not yet paved with ballast)that by the present Chinese standard(TB 10002.3—2005),if ballasted concrete girder bridge temperature power exponential function index a rises by 20%to 40%,it is closer to the temperature gradient changes during construction.

关 键 词：混凝土温度梯度 有限元模型 箱形梁桥截面 

分 类 号：U24[交通运输工程—道路与铁道工程]